This index is a work in progress.... I am working from both ends (I've just added May 2010), and I will meet in the middle eventually. Some books may have been published in their country of origin earlier than the date I have for them.13 Hangmen, by Art Corriveau (2012)13 Secrets, by Michelle Harrison (2012)The 13th Sign, by Kristin O'Donnell Tubb (2013) 11,000 Years Lost, by Peni R. Griffin (2006)